One day, I tried to disassemble my hydraulic braking system (Tektro HDC 300) having a goal of dipping the brake pads in alcohol. Well, I had somehow managed to separate the pads and the spring like metal object. But at one stage, after I squeezed the brake lever for a couple of times, one of the two pistons came out and all the oil got spilled... now my brake doesn't work at all. How can I fix it?
It can be noted that I feel no resistance while pressing brake lever? Is this normal under this circumstance? Will I have to change the whole brake set, or will just refilling with oil be enough?